Model 6231 (147)
The Model 6231 is a general-purpose 16-channel narrowband digital receiver VIM-2 module. It attaches directly to VIM-compatible processor boards and connects directly to two processors.
*Two 65 or 80 MHz, 14-bit A/D converters *Optional front panel FPGA I/O connector *All downconverters can select any of the two inputs *90 MHz input bandwidth *3.2 kHz to 1.6 MHz output bandwidths for ƒs = 64 MHz *Front panel clock and sync bus synchronize multiple boards *See Model 7131 for PMC version
Model 6231 accepts two analog RF inputs
at +4 dBm full scale into 50 ohms on front
panel SMA connectors. Amplifier bandwidth
of 90 MHz supports direct IF undersampling.
Each input is amplified and, optionally,
lowpass filtered to remove out-of-band signals
and prevent aliasing. The filters may be bypassed
for undersampling applications.
Optionally available, transformer-coupled
inputs reduce distortion for input signals
above 10 MHz and are recommended for IF
Each of the two inputs is then digitized by
a 14-bit A/D converter which is capable of
operating at sample rates up to 65 MHz
(Analog Devices AD6644) or, optionally,
80 MHz (AD6645). The A/D converter
clock can be driven from an internal 64 MHz
or 80 MHz crystal oscillator, or from an external
sample clock supplied through a front
panel SMA connector.
The 6231 includes four Graychip GC4016
quad narrowband downconverter chips.
The maximum input sampling rate for the
GC4016 is 80 MHz. Each device includes
four independently tuned receiver channels
capable of center frequency tuning from DC
to 32 MHz, and with output bandwidths
ranging from 3.2 kHz to 1.6 MHz (for 64 MHz
Each GC4016 accepts four 14-bit parallel
inputs from the two A/D converters. Internal crossbar switches allow all 16 channels
on the board to select either of the A/D inputs
for flexible switching.
The front panel clock and sync bus allow
one 6231 to act as a master, driving the
sample clock out to a front panel cable bus
using LVDS differential signaling. Multiple
slaves can then be clocked synchronously
with the master. Additional sync lines allow
synchronization of the local oscillator phase,
frequency switching, decimating filter phase,
and FIFO data collection on multiple 6231’s.
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